While going out to fetch some ice cream with Ally, Zuzu overhears some LID students talk about how Sylvio is planning to take revenge against Yuya. Wanting to pay Yuya back for saving her, Zuzu follows them to Sylvio's hideout and challenges Sylvio to a duel. Before the duel can begin, a mysterious masked man appears who takes Zuzu's place in the duel. After the masked man sets five spell cards, Sylvio summons out Mobius the Mega Monarch to destroy them. The masked man activates the cards from the graveyard and uses them as monsters on his field to perform Xyz Summon Dark Rebellion Xyz Dragon. He uses all its Overlay effects to destroy Mobius and the effects of his attack prove real even outside of an Action Duel. After the masked man presses Sylvio about Duel Academy, Sylvio tries to activate a trap against him but is thwarted and loses the duel. As the man removes his mask that reveals a face that looks identical to Yuya, Zuzu's bracelet mysteriously glows during which time the man disappears. As Yuya arrives on the scene after being informed by Ally, Zuzu wonders just who that duelist was.